County Wiki | https://en.wikipedia.org/wiki/St._Charles_County,_Missouri
Populated Areas Wiki | https://en.wikipedia.org/wiki/Category:Populated_places_in_St._Charles_County,_Missouri
| Institution | City | Type |
|---|---|---|
| Saint Charles City - County Library Admin | c | |
| Boone's Trail Branch Library | New Melle | c |
| Corporate Parkway Branch Library | Wentzville | c |
| Deer Run Branch Library | O'Fallon | c |
| Kisker Road Branch Library | St. Charles | c |
| Library Express at Discovery Village | Wentzvile | c |
| Library Express at WingHaven | O'Fallon | c |
| Linnemann Branch Library | St. Charles | c |
| Mcclay Branch Library | St. Charles | c |
| Middendorf-Kredell Branch Library | O'Fallon | c |
| North County Branch Library | Portage De Sioux | c |
| South County Branch Library | Augusta | c |
| Spencer Road Branch Library | St. Peters | c |